We had an espaliered Victoria plum, it took about four years from planting to give fruit and then the fruit was delicious. One year it gave us absolutely massive amounts of fruit and then just died. So now I'm planning to plant another one, but free-standing this time. However, according to one of the websites that I'm looking at "The fruit usefully ripens over several weeks.", which was never our experience. We always found that everything was ripe over the course of a week to 10 days at the most, and then it was done. I wonder if it was the difference between an espalier tree and free-standing one. If you have a free-standing Victoria plum, how long does it fruit for roughly?